Test bench and test system for testing at least two low-voltage batteries of vehicle

Abstract

The utility model relates to a testboard used for testing at least two low-voltage batteries of a vehicle, the testboard (1) comprises a signal module (2) and a power module (3), the signal module (2) at least comprises at least one signal acquisition device (4) used for acquiring electrical parameters of the at least two low-voltage batteries; and a data recorder (5) arranged as an interface for connection to at least one bus of the vehicle (8) and for recording bus signals of the at least one bus, the power module (3) comprising at least: a direct current charger (7) arranged for charging the at least two low voltage batteries, respectively; and at least one discharge load (6) arranged for discharging the at least two low-voltage batteries. In addition, the utility model relates to a test system for testing at least two low-voltage batteries of a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to a test board for testing at least two low-voltage batteries of a vehicle and a test system for testing at least two low-voltage batteries of a vehicle. BACKGROUND

[0002] The management of low-voltage batteries is critical in internal combustion engine vehicles (ICEV) and hybrid electric vehicles (HEV) that mainly use internal combustion engines as power sources. Low-voltage batteries provide electrical energy for vehicle starting and on-board equipment operation. In order to meet the power demand of different on-board equipment, at least two low-voltage batteries, such as 12V batteries and 48V batteries, are often equipped at the same time, wherein the 12V battery can supply power to conventional on-board equipment, such as starter, car light, wiper, infotainment system, etc., while the 48V battery is mostly responsible for running the chassis control system, running the air conditioning system, storing regenerative braking energy, driving the electric supercharger and turbine, etc., to meet the power demand of on-board equipment with higher power requirements. In actual operation, the 12V battery and the 48V battery do not work independently, but through the preset energy conversion logic function of the vehicle to realize efficient distribution and management of electrical energy, to ensure that the vehicle can operate stably under various working conditions. At the same time, the vehicle itself also has fault diagnosis and fault handling functions for low-voltage batteries to ensure the safe operation of low-voltage batteries and avoid electrical hazards such as overvoltage and overcurrent in the vehicle.

[0003] However, the current test of low-voltage batteries only verifies the electrical performance of the battery itself, neither integrates the charging and discharging of each low-voltage battery in the vehicle, i.e. the power supply and power load, nor tests each low-voltage battery in combination with the operation of the vehicle, especially the energy conversion logic function, fault diagnosis and fault handling, etc.

[0004] In view of the deficiencies of the prior art, there is an urgent need for a solution for testing at least two low-voltage batteries of a vehicle. SUMMARY

[0005] The task of the utility model is to provide a test board and a test system for testing at least two low-voltage batteries of a vehicle, to realize charging and discharging of the at least two low-voltage batteries in the vehicle, thereby simulating the operating environment of these low-voltage batteries in the vehicle, and at the same time, the electrical parameters of each low-voltage battery can be collected, and the signals appearing in the vehicle can be recorded at the same time. Thus, not only the battery performance of the low-voltage battery can be detected, but also whether the vehicle performs the logic function related to the low-voltage battery as preset can be monitored.

[0006] The term "vehicle" or "vehicular" or other similar terms as used herein generally includes motor vehicles, such as including sport utility vehicles (SUVs), passenger cars, trucks, commercial vehicles, passenger vehicles, and the like, and includes both internal combustion engine vehicles and hybrid electric vehicles (HEVs).

[0007] One aspect of the utility model relates to a test bench for testing at least two low-voltage batteries of a vehicle, wherein the test bench comprises a signal module and a power module, wherein the signal module comprises at least: at least one signal acquisition device configured to acquire electrical parameters of the at least two low-voltage batteries; and a data logger configured to connect to an interface of at least one bus of the vehicle and record bus signals of the at least one bus, and the power module comprises at least: a DC charger configured to charge the at least two low-voltage batteries respectively; and at least one discharge load configured to discharge the at least two low-voltage batteries.

[0008] According to the utility model, in the test bench for testing at least two low-voltage batteries of a vehicle, the signal module, which is sensitive to electricity, and the power module, which has high power consumption, are separated from each other to avoid interference and damage risk, and to ensure the accuracy of test results and the safety of components.

[0009] The signal module of the test bench comprises at least one signal acquisition device and a data logger. The at least one signal acquisition device is connected to the at least two low-voltage batteries of the vehicle and acquires electrical parameters of these low-voltage batteries respectively to evaluate the electrical performance of the low-voltage batteries. Exemplarily, one or more signal acquisition devices can acquire the voltage and current of each low-voltage battery respectively, and preferably form a data list and / or a data curve of the real-time acquired voltage and current. To this end, the signal acquisition device can preferably be a multi-channel signal acquisition device, and the range, sampling frequency and / or resolution of the signal acquisition device can be selected according to the specifications of the measured low-voltage battery. While acquiring the electrical parameters of the low-voltage battery, the data logger connected to the interface of the at least one bus of the vehicle can record the bus signals of the at least one bus to obtain the corresponding operation of the vehicle, such as the working state and fault information of the vehicle. Thus, the signal module can obtain comprehensive feedback of the low-voltage battery running in the vehicle. Compared with testing the low-voltage battery separately, the signal module of the test bench can not only accurately measure the electrical performance of the low-voltage battery, but also monitor the control response of the vehicle, such as whether the fault information, in particular the fault code or the fault prompt, appears as expected, or whether the logic function related to the low-voltage battery, in particular the safety circuit, the auxiliary power supply, the mutual charging and the like, is executed as preset, thereby reliably and efficiently verifying the management of the vehicle for the low-voltage battery.

[0010] The power module of the test bench comprises at least a DC charger and at least one discharging load, wherein the at least two low-voltage batteries can be charged by the DC charger and discharged by the at least one discharging load. Here, the DC charger can preferably have a high-precision current-voltage control function, and its output voltage range can be flexibly adjusted to accurately match the charging requirements of low-voltage batteries of different specifications. The at least one discharging load can be, for example, an electronic load to simulate different discharging conditions. In particular, the discharging load can realize multiple modes such as constant-current discharge, constant-resistance discharge, constant-power discharge, and even near-short-circuit discharge. Through the power module, the working mode of the low-voltage battery during vehicle operation can be well restored, such as the charging of the internal combustion engine to at least one of the at least one low-voltage battery, and the power supply of the at least one low-voltage battery to the on-board equipment. Furthermore, through the DC charger and the discharging load, overvoltage, overcurrent, and / or overload conditions that are usually limited or not allowed to occur in the vehicle can be simulated, and the low-voltage battery can be overcharged and / or overdischarged according to the test requirements.

[0011] Therefore, by means of the test bench according to the utility model, the charging and discharging of the at least two low-voltage batteries in the vehicle can be realized, thereby simulating the operating environment of these low-voltage batteries in the vehicle, and at the same time, the electrical parameters of the low-voltage batteries can be collected, and at the same time, the bus signals in the vehicle are recorded accordingly, thereby not only the battery performance of the low-voltage batteries can be detected, but also whether the vehicle executes the logic functions related to the low-voltage batteries according to the preset can be monitored.

[0012] According to an embodiment of the utility model, the signal module of the test bench can further comprise a real-time controller, which is configured to read and / or write fault signals via a diagnostic interface of the vehicle. Via the diagnostic interface, also referred to as OBD interface, access to fault information of the vehicle, in particular fault codes (also referred to as DTCs), software and hardware information (such as version numbers) and software and firmware upgrades can be achieved. It is particularly advantageous that the real-time controller can be connected to the wiring harness in the vehicle via the diagnostic interface, also referred to as OBD interface, and thus control the electronic control unit (ECU) for managing the low-voltage battery in the vehicle and write fault signals, such as open-circuit fault signals or short-circuit fault signals, to the electronic control unit. In this way, an error can be artificially injected into the vehicle, and at the same time the electrical parameters of the low-voltage battery can be acquired as described above and the bus signals in the vehicle can be recorded accordingly. In this way, it can be verified whether the low-voltage battery is controlled as intended, such as switched off or isolated, and whether the vehicle activates the corresponding protection mechanisms, etc. Alternatively or additionally, the signal module of the test bench can further comprise an emulator, which is configured to be connected to the diagnostic interface of the vehicle and / or the interface of the at least one bus for monitoring the fault signals and / or the bus signals accordingly. Here, the real-time controller and the emulator have a functional overlap, both for controlling and testing the corresponding parts of the vehicle, wherein the real-time controller focuses on real-time capability and hardware interaction, while the emulator focuses on software simulation and automated test runs. Here, both can be selected according to the test requirements. In addition, the signal module of the test bench can optionally comprise a power supply monitor, which is configured to be connected to the distribution box of the vehicle for monitoring the power mode signals of the vehicle. Here, the power mode signals can in particular refer to the KL30, KL15, KL50, KLR, KL31, KL75, KL87 signals of the vehicle, which represent different power modes, such as normal state, upper point state, starting state, parking state, etc., and can provide vehicle status, battery information and battery operating state, etc.

[0013] According to an embodiment of the utility model, the power module of the test bench can further comprise an oscilloscope, which is configured to be connected to the at least two low-voltage batteries for capturing transient changes in the electrical parameters of the at least two low-voltage batteries. An oscilloscope with high time resolution can capture rapidly changing signals, so an oscilloscope can be particularly advantageously used to capture transient changes in the low-voltage battery, in particular when the vehicle is started. Alternatively or additionally, the power module of the test bench can further comprise a power supply, which is configured to supply power to the signal module of the test bench. An internal power supply in the test bench can be advantageously used to simplify the power connections in the test bench.

[0014] According to an embodiment of the utility model, the electrical parameters can include at least one of voltage, current, power, internal resistance, state of charge (SOC), state of health (SOH) and depth of discharge (DOD). Alternatively or additionally, the at least one bus can include at least one of CAN bus, LIN bus and FlexRay bus. Here, the CAN bus can be particularly a power domain CAN bus of the vehicle; the LIN bus can communicate between low-voltage batteries based on a private protocol; and the FlexRay bus is used to transmit display information, particularly fault prompts. Thus, through these buses, the control response of the vehicle can be efficiently monitored in multiple levels, such as whether the fault information, particularly fault codes and / or fault prompts, appears as expected, and / or whether the logic functions related to the low-voltage battery, such as safety circuit breaking, auxiliary power supply, etc., are performed as preset, so that the management of the vehicle on the low-voltage battery can be reliably and efficiently verified. In addition, the signal acquisition device can be preferably connected to the at least two low-voltage batteries through a current shunt to protect the electrically sensitive signal modules of the test bench.

[0015] According to an embodiment of the utility model, the test bench can be connected to a computer, wherein the computer is configured to receive and process the electrical parameters from the signal acquisition device and the bus signals from the at least one bus of the data logger, and the computer is configured to control the components of the test bench. Here, the test bench can advantageously communicate with the computer as a host computer to perform storage and analysis comparison of at least the electrical parameters and the bus signals, and optionally the vehicle state and fault signals. The computer can also be preferably connected to the aforementioned real-time controller and / or emulator and / or power monitor. It is also possible that the computer is directly connected to the diagnostic interface of the vehicle and / or the interface of the at least one bus, thereby directly communicating signals with the vehicle. Based on the computing power of the computer, the conversion, matching and visualization of data can be advantageously achieved by means of the corresponding software installed thereon, such as CANoe, Labview, Matlab / simulink, EDIABAS, ECUTest, etc., and the process of the test can be human-friendly controlled.

[0016] According to an embodiment of the utility model, the signal module and the power module of the test bench can be accommodated in a cabinet, and signal ports for signal connection and wiring ports for electrical connection can be arranged on the surface of the cabinet. Here, the components of the test bench can be integrated by means of the cabinet, the wiring required for testing is simplified, and potential hazards caused by incorrect connection can be avoided.

[0017] According to an embodiment of the utility model, a start button, a stop button, a state indicator lamp and an emergency stop button can be arranged on the surface of the cabinet. Here, the buttons and the indicator lamp provide convenience for the test personnel and simplify the test operation. In addition, the test bench can simultaneously test at least two vehicles. To this end, at least the signal acquisition device and the data logger can be configured to be multi-channel so as to simultaneously acquire and record, thereby greatly improving the test efficiency.

[0018] According to an embodiment of the utility model, the test bench can be configured to test the charge and discharge performance of the at least two low-voltage batteries and / or test the control logic of energy conversion between the at least two low-voltage batteries. In order to ensure the long-term stable operation of the low-voltage battery in the vehicle, particular attention is paid to its charge and discharge performance and the energy conversion therebetween. In the test bench according to the utility model, the power supply and the power consumption of the vehicle in various states, such as the driving state, the starting state and the power consumption state, can be created with high precision by means of the DC charger and the discharge load, so as to test the charge and discharge performance of the low-voltage battery without the actual driving operation of the vehicle. In addition, the at least two low-voltage batteries can be conveniently placed in different states of charge by means of the DC charger and the discharge load, so as to create the conditions for energy conversion therebetween, artificially causing one low-voltage battery to charge or assist the power supply of the other low-voltage battery.

[0019] According to an embodiment of the utility model, the test bench can be configured to: acquire electrical parameters during the charge and discharge process of the at least two low-voltage batteries; and / or test the operation of the vehicle under extreme conditions of the at least two low-voltage batteries; and / or detect the response of the vehicle when an error is injected. Here, based on the cooperation of the signal module and the power module in the test bench, the behavior characteristics of the low-voltage battery during the battery charge and discharge process and / or under extreme conditions (for example, destructive test of extremely low state of charge) and / or under fault conditions can be particularly advantageously monitored.

[0020] Another aspect of the utility model relates to a test system for testing at least two low-voltage batteries of a vehicle, wherein the test system comprises a vehicle and a test bench for testing at least two low-voltage batteries of a vehicle according to the utility model.

[0021] It should be noted that the features, functions, effects and advantages according to one aspect of the utility model can also be referred to the above description of other aspects of the utility model. In addition, the various aspects described in the utility model can be combined with each other in various ways.

[0022] Further features of the utility model are derived from the drawings and the detailed description. All the above-mentioned features and feature combinations mentioned in the description and the following features and feature combinations mentioned in the detailed description and / or shown separately in the drawings can not only be used in the combinations given accordingly, but also in other combinations or in an individual state. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a block diagram of a test bench according to an embodiment of the utility model together with a connected vehicle;

[0024] Figure 2 is a block diagram of a test bench according to another embodiment of the utility model together with a connected vehicle and a computer;

[0025] Figure 3 is an exemplary appearance of a test bench according to the utility model as a cabinet. DETAILED DESCRIPTION

[0026] Figure 1 shows a block diagram of a test bench according to an embodiment of the utility model together with a connected vehicle. According to Figure 1 shown, a test bench 1 for testing at least two low-voltage batteries of a vehicle comprises a signal module 2 and a power module 3, wherein the signal module 2 comprises at least one signal acquisition device 4 arranged to acquire electrical quantities of the at least two low-voltage batteries and a data logger 5 arranged to connect to an interface of at least one bus of the vehicle and to record bus signals of the at least one bus, and the power module 3 comprises at least a DC charger 6 arranged to charge the at least two low-voltage batteries respectively and at least one discharge load 7 arranged to discharge the at least two low-voltage batteries.

[0027] In order to clearly show the connection relationship of the test bench with the vehicle to be tested, Figure 1 An additional vehicle 8 is shown. Here, the vehicle 8 comprises two low-voltage batteries, namely a first low-voltage battery 9 and a second low-voltage battery 10. According to the conventional configuration of an internal combustion engine vehicle, such as a fuel car, the first low-voltage battery 9 may, for example, be a 48V battery, and the second low-voltage battery 10 may, for example, be a 12V battery. In the vehicle, the 12V battery can supply power to conventional on-board equipment, such as a starter, a headlight, a wiper, an infotainment system, etc., while the 48V battery is mostly responsible for running a chassis control system, running an air conditioning system, storing regenerative braking energy, driving an electric supercharger and a turbo, etc. For the sake of clarity, the power supply layout of the first low-voltage battery 9 and the second low-voltage battery 10 in the vehicle is not shown in Figures 1 to 2

[0028] In Figure 1 ​In the embodiment shown, the signal module 2 of the test bench 1 comprises a signal acquisition device 4 and a data logger 5. The signal acquisition device 4 is connected to the first low-voltage battery 9 and to the second low-voltage battery 10, respectively, and acquires electrical parameters of these two low-voltage batteries. Here, the signal acquisition device 4 can preferably be designed as multi-channel in order to simultaneously receive and record electrical parameters of different low-voltage batteries of one and the same vehicle or of two or more low-voltage batteries of different vehicles. As electrical parameters acquired by the signal acquisition device 4, at least one of the following can be considered: voltage, current, power, internal resistance, state of charge, state of health and depth of discharge.

[0029] In addition to the acquisition of electrical parameters, the data logger 5 can be connected to at least one bus interface of the vehicle 8, here to three bus interfaces, for example via a wiring harness, and record the bus signals on these buses accordingly in order to obtain the respective operating conditions of the vehicle 8, such as operating states and fault information of the vehicle 8, etc., whereby the control responses to the vehicle 8, such as whether fault information, in particular fault codes or fault messages, occur as intended, or whether logic functions related to the low-voltage batteries, such as safety shutdown, auxiliary power supply, etc., are executed as intended, can be monitored synchronously. Figure 1 The first bus interface 11 shown in

[0030] The power module 3 of the test bench 1 comprises, in the embodiment shown, Figure 1 a DC charger 7 and at least one discharge load 6, here only one discharge load, in particular an electronic load, in order to simulate different discharge operating conditions. In Figure 1 In order to distinguish from the signal lines leading from the signal module 2, the power lines leading from the power module 3 are thickened in

[0031] When testing the low-voltage battery of vehicle 8 on test bench 1, different charging / discharging conditions are simulated by power module 3, and electrical parameters of low-voltage battery are collected by signal module 2 and bus signals of at least one bus of vehicle 8 are recorded at the same time. This not only detects the battery performance of low-voltage battery, but also monitors whether the vehicle executes logic functions related to low-voltage battery as preset.

[0032] Figure 2 This is a block diagram of a test bench according to another embodiment of the present invention, together with the connected vehicle and computer. Figure 2 The test bench 1 shown has Figure 1 The signal acquisition device 4 and data logger 5 of signal module 2, and the DC charger 7 and discharge load 6 of power module 3 are also included. To avoid repetition, only the following descriptions are provided. Figure 2 and Figure 1 The differences between them.

[0033] In accordance with Figure 2 In the test bench 1 shown, the signal module 2 may further include a real-time controller 14. The real-time controller 14 is connected to the diagnostic interface 15 of the vehicle 8 and reads and / or writes fault signals from the vehicle 8 via the diagnostic interface 15. Particularly advantageously, the real-time controller 14 can access the wiring harness in the vehicle 8 via the diagnostic interface 15, or OBD interface, and thus control the electronic control unit (ECU) managing the low-voltage battery within the vehicle, and write fault signals, such as open-circuit fault signals or short-circuit fault signals, to the ECU. This allows for the artificial injection of errors into the vehicle. In this way, it can be verified whether the low-voltage battery is controlled as preset under fault conditions, such as disconnected or isolated, and whether the vehicle 8 activates the corresponding protection mechanisms, etc. Furthermore, the signal module 2 may also include an emulator 16. The emulator 16 is connected here to the diagnostic interface 15, the first bus interface 11, the second bus interface 12, and the third bus interface 13 of the vehicle 8 for corresponding monitoring, i.e., monitoring and controlling fault signals and / or bus signals. Moreover, the signal module 2 may also include a power monitor 18. The power monitor 18 is connected to the vehicle's electrical distribution box 17 to monitor, i.e., to monitor and control the power mode signals of the vehicle 8. Here, the power mode signals may specifically refer to signals such as KL30, KL15, KL50, KLR, KL31, KL75, and KL87 of the vehicle, thereby providing information such as vehicle status, battery information, and battery operating status.

[0034] In addition, Figure 2 In order to ensure the electrical safety of the signal acquisition device 4, a current shunt S is also provided on the signal line connecting the signal acquisition device 4 to the first low-voltage battery 9 and the second low-voltage battery 10.

[0035] Apart from Figure 2 In addition to the above-described optional further expansion schemes for signal module 2 shown in the figure, according to Figure 2 The power module 3 in the test bench 1 shown may also include an oscilloscope 21. The oscilloscope 21 may be connected to the two terminals of the first low-voltage battery 9 and the second low-voltage battery 10, respectively, to capture transient changes in the electrical parameters of these low-voltage batteries. In addition, the power module 3 may also include a power supply 21, which can power the signal module 2 of the test bench 1 to simplify the power wiring of the test bench.

[0036] exist Figure 2 In the power module 3, there are also two discharge loads. The first discharge load 6 can discharge the first low-voltage battery 9, which is a 48V battery, and the second discharge load 6' can discharge the second low-voltage battery 10, which is a 12V battery. Thus, the separate discharge loads can be designed for different specifications of different low-voltage batteries and therefore parallel discharge tests can be carried out independently and safely.

[0037] exist Figure 2 The connection between the test bench 1 and the computer 19 is also advantageously shown. Here, the computer 2 can at least be configured to receive and process electrical parameters from the signal acquisition device 4 and bus signals from the at least one bus of the data logger 5. Figure 3 As shown, computer 2 can also be connected as a host computer to the real-time controller 14, simulator 16, and power monitor 18. Alternatively, computer 19 can be directly connected to the diagnostic interface 15 of vehicle 8 and the interfaces of various buses, thereby directly communicating with vehicle 8. Simultaneously, the computer can also be configured to control various components of the test bench, such as activating corresponding components and sending commands to them.

[0038] Figure 3 The diagram illustrates an exemplary appearance of the test bench as a cabinet according to the present invention. Figure 3In the embodiment shown, the signal module 2 and the power module 3 of the test bench 1 are accommodated together in a cabinet 22. In this way, the components of the test bench 1 can advantageously be integrated, the wiring required for the test can be simplified and potential sources of error due to incorrect connections can be avoided. The ports of the test bench 1 that need to be connected and the panel for the operator are provided on the front of the cabinet 22. At the top of the cabinet 22, a start button 24, a stop button 23, a status indicator 25 and an emergency stop button 26 are arranged. Below this, a signal panel 27 is provided. The signal panel 27 is provided with a plurality of signal ports 28 for signal connections. The signal ports 28 can here have various forms, such as DB-9, OPEN-5, M12, BNC, wire jacks, etc., depending on the vehicle interface to be connected. At the bottom of the cabinet, an electrical panel 30 is provided, which is provided with a plurality of connection ports 29 for electrical connections. The connection ports 29 can be used for connecting the components of the power module 3 to the low-voltage battery of the vehicle 8. Between the signal panel 27 and the electrical panel 30, an oscilloscope 21, a DC charger 7, a first discharge load 6 and a second discharge load 6' can be arranged from top to bottom, so that the operator can easily operate these components.

[0039] It is particularly preferred that the test bench 1 or the power module 3 ​ The cabinet 22 shown can simultaneously test at least two vehicles 8. For this purpose, at least the signal acquisition device 4 and the data logger 5 and optionally the implementation controller 14, the emulator 16 and the power supply controller 18 can be designed to be multi-channel in order to enable simultaneous acquisition and recording, which greatly increases the test efficiency. At the same time, the DC charger 7 and the discharge loads 6 in the power module 3 can also be designed to be multi-channel or the number thereof can be increased accordingly in order to enable parallel testing.

[0040] During the testing of the at least two low-voltage batteries of the vehicle, the test stand 1 advantageously can test the charge and discharge performance of the at least two low-voltage batteries and / or test the control logic of the energy conversion between the at least two low-voltage batteries. To this end, the electrical energy supply and the electrical energy consumption of the vehicle in various states can be created with high precision by means of the DC charger 7 and the discharge load 6, so that the charge and discharge performance of the low-voltage batteries can be tested without the actual driving maneuver of the vehicle having to be carried out. Furthermore, by means of the DC charger 7 and the discharge load 6 it is also possible to easily place the at least two low-voltage batteries in different states of charge, so that conditions for the energy conversion therebetween are created, one of the low-voltage batteries is artificially caused to charge the other low-voltage batteries or to assist in supplying them with electrical energy. Particularly preferably, on the basis of the interaction of the signal module 2 and the power module 3 in the test stand 1, the test stand 1 can also acquire electrical variables during the charging and discharging of the at least two low-voltage batteries; and / or test the operation of the vehicle in extreme conditions of the at least two low-voltage batteries, for example a destructive test with a very low state of charge; and / or detect the response of the vehicle when errors are injected.

[0041] The utility model is not limited to the embodiments shown, but includes or extends to all technically equivalent embodiments that fall within the effective scope of the appended claims. The positional designations chosen in the specification, such as, for example, upper, lower, left, right, and the like, refer directly to the description and the figures shown and can be transferred to new positions in terms of meaning when the positions change.

[0042] The features disclosed in this application document are important not only for the realization of the embodiments in different design schemes but also can be realized in any combination and can be realized.

[0043] The utility model although has disclosed as above with preferable embodiment, it is not used to limit the utility model, any person skilled in the art can utilize the method and technical content disclosed above to make possible change and modification to the utility model technical scheme without departing from the spirit and scope of the utility model, therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the utility model, all belong to the protection scope of the utility model technical scheme.

Claims

1. Test bench for testing at least two low-voltage batteries of a vehicle, characterized in that The test bench (1) comprises a signal module (2) and a power module (3), wherein the signal module (2) comprises at least a signal acquisition device (4) configured to acquire electrical parameters of the at least two low-voltage batteries and a data logger (5) configured to connect to an interface of at least one bus of the vehicle (8) and record bus signals of the at least one bus, and the power module (3) comprises at least a DC charger (7) configured to charge the at least two low-voltage batteries respectively and at least one discharge load (6) configured to discharge the at least two low-voltage batteries.

2. The test stand of claim 1, wherein, The signal module (2) of the test bench (1) further comprises: a real-time controller (14) configured to read and / or write fault signals via a diagnostic interface (15) of the vehicle; and / or an emulator (16) configured to connect to the diagnostic interface (15) and / or the interface of the at least one bus of the vehicle for monitoring fault signals and / or bus signals respectively; and / or a power supply monitor (18) configured to connect to a distribution box (17) of the vehicle for monitoring power mode signals of the vehicle (8).

3. Test bench according to claim 1 or 2, characterized in that The power module (3) of the test bench (1) further comprises an oscilloscope (21) configured to connect to the at least two low-voltage batteries for capturing transient changes of the electrical parameters of the at least two low-voltage batteries and / or a power supply (22) configured to supply power to the signal module (2) of the test bench (1).

4. Test bench according to claim 1 or 2, characterized in that The electrical parameters comprise at least one of voltage, current, power, internal resistance, state of charge, state of health and depth of discharge; and / or The at least one bus comprises at least one of a CAN bus, a LIN bus and a FlexRay bus; and / or The signal acquisition device (4) is connected to the at least two low-voltage batteries through a current shunt (S).

5. Test bench according to claim 1 or 2, characterized in that The test bench (1) is connectable to a computer (19) configured to receive and process the electrical parameters from the signal acquisition device (4) and the bus signals of the at least one bus from the data logger (5), and the computer (19) is configured to control components of the test bench (1).

6. Test bench according to claim 1 or 2, characterized in that The signal module (2) and the power module (3) of the test bench (1) are housed in a cabinet (22), and signal ports (28) for signal connection and wiring ports (29) for electrical connection are arranged on a surface of the cabinet (22).

7. The test stand of claim 6, wherein Start buttons (24), stop buttons (23), status indicator lights (25) and emergency stop buttons (26) are arranged on the surface of the cabinet (22); and / or the test bench (1) is capable of testing at least two vehicles simultaneously.

8. Test bench according to claim 1 or 2, characterized in that The test bench (1) is configured to test charge and discharge performance of the at least two low-voltage batteries and / or test control logic of energy conversion between the at least two low-voltage batteries.

9. The test stand of claim 7, wherein, The test bench (1) is configured to: acquire electrical quantities during the charging and discharging of the at least two low-voltage batteries; and / or test the operation of the vehicle in extreme conditions of the at least two low-voltage batteries; and / or detect the response of the vehicle when an error is injected.

10. A test system for testing at least two low voltage batteries of a vehicle, characterized in that, The test system comprises a vehicle and a test bench for testing at least two low-voltage batteries of a vehicle according to one of claims 1 to 9.

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